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Finding the Fourth Proportional to 1,091.18, 1,636.64 and 543.72

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Solution

The fourth proportional to 1,091.18, 1,636.64 and 543.72 is: 815.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.18 : 1,636.64 = 543.72 : x
  2. Step 2: Convert to fraction form
    1,091.18/1,636.64 = 543.72/x
  3. Step 3: Cross multiply
    1,091.18x = 1,636.64 × 543.72
  4. Step 4: Simplify right side
    1,091.18x = 889,873.90
  5. Step 5: Solve for x
    x = 889,873.90/1,091.18
  6. Step 6: Final answer
    x = 815.52

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.